Gevorkyan – Fundamentals of Welding
The textbook “Gevorgyan – Fundamentals of Welding” covers the fundamentals of arc, electroslag, resistance, and gas welding, oxygen and electric arc cutting, as well as the specifics of welding alloy steels, non-ferrous metals and their alloys, cast iron, and plastics, as well as methods and modes for welding pipelines.
The 4th edition of Gevorkyan – Fundamentals of Welding includes changes to equipment and materials, an expanded description of resistance welding machines, and a chapter on “Supply Work.”
Welded joints are generally as strong as the metal from which they are made. Welded structures perform well under alternating and dynamic loads, at high temperatures and pressures.
It should be especially emphasized that working conditions during welding, in terms of both hygiene and safety, are significantly better than those during riveting and, especially, casting.
Welding is the process of producing a permanent connection by establishing interatomic bonds between the parts being welded through their local or general heating, plastic deformation, or the combined action of both.
To weld, the edges of the parts to be joined must be brought together and the conditions necessary for interatomic bonds to form between them must be created.
There are over 60 types of welding, classified according to their basic physical, technical, and technological characteristics. Based on their physical characteristics and the form of energy used, welding is divided into three classes: thermal, thermomechanical, and mechanical. Thermal welding includes welding types that utilize thermal energy (arc, electroslag, electron beam, plasma, gas, etc.). Thermomechanical welding includes welding types that utilize pressure and thermal energy (contact, diffusion, and various press types). Mechanical welding includes welding types that utilize mechanical energy and pressure (cold, explosion, ultrasonic, friction, etc.).
The technical characteristics of the various types of welding are as follows:
- By the method of metal protection in the welding zone (in air, in a vacuum, in a shielding gas, under flux, with flux, in foam, with combined protection);
- By the continuity of the process (continuous, intermittent);
- By the degree of mechanization (manual, mechanized, automated, automatic);
- By the type of shielding gas (active gases, inert gases and their mixtures);
- By the nature of metal protection in the welding zone (with spray shielding, in a controlled atmosphere).
